Solve the system using the inverse matrix method.
A. x = 42, y = 63, z = 26; (42, 63, 26)
B. x = -2, y = 13, z = -6; (-2, 13, -6)
C. x = -7, y = 19, z = -6; (-7, 19, -6)
D. x = 6, y = 0, z = 0; (6, 0, 0)
Answer: B
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A. 
B. 
C. 
D. 
Solve.A box is constructed by cutting out square corners of a rectangular piece of cardboard and folding up the sides. If the cutout corners have sides with length x, then the volume of the box is given by the polynomial 4x3 - 76x2 + 352x. 
Find the volume of the box when x = 3 inches.
A. 372 in.3 B. 480 in.3 C. 1848 in.3 D. 160 in.3
State if the vectors a and b are perpendicular, parallel, or neither. If a and b are parallel, state whether they point in the same direction or in opposite directions.a = 10i + 8j, b = 8i + 7j
A. Parallel, same direction B. Perpendicular C. Parallel,opposite directions D. Neither
Factor the polynomial.x2 + 8xy + 16y2
A. (x - 4y)2 B. (x + 4)2 C. (x - 4y)(x + 4y) D. (x + 4y)2